diff -r 462dd9238173 -r 697da4d02f93 ko/bck2brwsr/src/main/java/org/apidesign/bck2brwsr/ko2brwsr/ConvertTypes.java
--- a/ko/bck2brwsr/src/main/java/org/apidesign/bck2brwsr/ko2brwsr/ConvertTypes.java	Wed Jun 26 19:29:54 2013 +0200
+++ b/ko/bck2brwsr/src/main/java/org/apidesign/bck2brwsr/ko2brwsr/ConvertTypes.java	Thu Jun 27 06:59:33 2013 +0200
@@ -70,7 +70,9 @@
     }
     
     @JavaScriptBody(args = { "object", "property" },
-        body = "if (property === null) return object;\n"
+        body = 
+          "if (property === null) return object;\n"
+        + "if (object === null) return null;\n"
         + "var p = object[property]; return p ? p : null;"
     )
     private static Object getProperty(Object object, String property) {